Abstract
The partial oxidation and CO 2 reforming of methane were studied on Pt/Al 2O 3, Pt/ZrO 2, and Pt/Ce–ZrO 2 catalysts. The reducibility and the oxygen transfer capacity were evaluated by oxygen storage capacity (OSC). The effect of the support on the cleaning mechanism of the catalyst surface was investigated by the sequence of CH 4/O 2 and CH 4/CO 2 pulses. The Pt/Ce–ZrO 2 catalyst showed the highest stability on both partial oxidation and CO 2 reforming of methane. The results were explained by the higher reducibility and oxygen storage/release capacity of Pt/Ce–ZrO 2 catalysts, which allowed a continuous removal of carbonaceous deposits from the active sites, favoring the stability of the catalysts, as revealed by the CH 4/O 2 and CH 4/CO 2 pulses. For Pt/Al 2O 3 and Pt/ZrO 2 catalysts, the increase of carbon deposits around or near the metal particle inhibits the CO 2 dissociation on CO 2 reforming of methane. This effect on the CO 2 reforming of methane affects the partial oxidation of methane, which comprehends two steps: combustion of methane and CO 2 and steam reforming of unreacted methane.
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